I am making wine jelly and have run out of lemons. I have some citric acid in the pantry. Can I use the citric acid instead? The jelly calls for half a cup of lemon juice. If I can use it, how much citric acid would I use?
This link http://www.livestrong.com/article/520416-how-to-substitute-lemon-juice-for-citric-acid/ says 1/4 teaspoon of citric acid substitutes 1 tablespoon of lemon juice.
So for half a cup of lemon juice, use two teaspoons of citric acid, and compensate for the missing liquid.